Definition and use standard of film hiding power

Abstract: 文章讨论了薄膜遮盖力的定义与使用标准。遮盖力指涂层在基材上吸收和散射光线的能力，通常通过两种方式表示：覆盖单位面积的最小涂料量和覆盖基材所需的最小膜厚。根据GB/T 1726-79(89)，通过在黑白格子玻璃板上测量涂料样品的最小涂料用量来确定遮盖力；GB/T 13452.3-92则使用反射率计测量薄膜的对比度，反映其遮盖力。当薄膜对比度达到0.95时，表示其遮盖力足以完全覆盖基材。

The hiding power of a film is the ability of the film to absorb and scatter light when the coating is applied to a substrate. The hiding power of a paint can be expressed in two ways, one is the minimum amount of paint required to cover a unit area, and the other is the minimum film thickness required to cover a substrate.

GB/T 1726-79(89) "Test Method for Hiding Power of Paint", brush or spray the paint sample to be tested on a black and white grid glass plate, calculate the minimum amount of paint covering a unit area, expressed in g/m2.

GB/T 13452.3-92 "Determination of Hiding Power of Coatings and Varnishes" uses a reflectance meter to measure the contrast of a film. The film coated on transparent paper was dried, placed on blackboard and whiteboard respectively, and its reflectance was measured. When the contrast of the film is 0.95, it is considered that the film can completely cover the substrate. When the contrast is 0.95, the covering power of the film is the coating rate (m2/L).